Test any number for primality with a single click.Features:* Uses a deterministic test,* Uses the Sieve of Eratophenes logic,* Simple interface, type the start and end numbers and press enter,* Dream ƒrequency "no-frills" style as described by Download.com Editor's Review,* Uses audio confirmation; beeps high if prime and beeps low if has factors.* Small application window allows simultaneous use with Microsoft Office, Internet Explorer, etc.,* Listed on the Math Forum @ Drexel (University) for Middle School, High School and College, ages 6+,* Sits in tray until needed.Free one month trial.